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https://issues.apache.org/jira/browse/IMPALA-13901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17938349#comment-17938349
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Joe McDonnell commented on IMPALA-13901:
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group_concat is also very sensitive to the order that rows arrive. It should
also be made ineligible.
> Make "histogram" and "sample" ineligible for tuple caching
> ----------------------------------------------------------
>
> Key: IMPALA-13901
> URL: https://issues.apache.org/jira/browse/IMPALA-13901
> Project: IMPALA
> Issue Type: Task
> Components: Frontend
> Affects Versions: Impala 5.0.0
> Reporter: Joe McDonnell
> Priority: Major
>
> "histogram" and "sample" use the same infrastructure as "appx_median", which
> includes randomness. These functions should be marked ineligible for tuple
> caching. This came up in some test cases when running with tuple cache
> verification.
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